A friend has used the 9mm shotshells in a SIg with interesting results. Squirrel, 20yds, several shots (that gun cycles them), and with each shot, the squirrel changed direction, like a shooting gallery target. Highly "motivated" squirrel left the vicinity.
Cat, 40yds (!) and one round was a laser death ray, really surprising my friend, and most certainly the cat!
I have some shot shells for .22 and .38, but have not had occassion to use them. I have shot .410 (Contender), and it does good for rats.
Here in NY state all snakes are protected.
Wow, I thought only the ones with political connections were protected!
Seriously, I wonder when that happened. When I was a lad in northern NY (45+years ago) they weren't protected. Depressingly, they had removed the $5 bounty from rattlesnakes before I was big enough to collect. Still, any rattlesnake was fair game, anytime, back in those days.